1 /*-
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #ifndef lint
34 #if 0
35 static char sccsid[] = "@(#)options.c 8.2 (Berkeley) 5/4/95";
36 #endif
37 #endif /* not lint */
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
40
41 #include <signal.h>
42 #include <unistd.h>
43 #include <stdlib.h>
44
45 #include "shell.h"
46 #define DEFINE_OPTIONS
47 #include "options.h"
48 #undef DEFINE_OPTIONS
49 #include "nodes.h" /* for other header files */
50 #include "eval.h"
51 #include "jobs.h"
52 #include "input.h"
53 #include "output.h"
54 #include "trap.h"
55 #include "var.h"
56 #include "memalloc.h"
57 #include "error.h"
58 #include "mystring.h"
59 #include "builtins.h"
60 #ifndef NO_HISTORY
61 #include "myhistedit.h"
62 #endif
63
64 char *arg0; /* value of $0 */
65 struct shparam shellparam; /* current positional parameters */
66 char **argptr; /* argument list for builtin commands */
67 char *shoptarg; /* set by nextopt (like getopt) */
68 char *nextopt_optptr; /* used by nextopt */
69
70 char *minusc; /* argument to -c option */
71
72
73 static void options(int);
74 static void minus_o(char *, int);
75 static void setoption(int, int);
76 static void setoptionbyindex(int, int);
77 static int getopts(char *, char *, char **, char ***, char **);
78
79
80 /*
81 * Process the shell command line arguments.
82 */
83
84 void
procargs(int argc,char ** argv)85 procargs(int argc, char **argv)
86 {
87 int i;
88 char *scriptname;
89
90 argptr = argv;
91 if (argc > 0)
92 argptr++;
93 for (i = 0; i < NOPTS; i++)
94 optval[i] = 2;
95 privileged = (getuid() != geteuid() || getgid() != getegid());
96 options(1);
97 if (*argptr == NULL && minusc == NULL)
98 sflag = 1;
99 if (iflag != 0 && sflag == 1 && isatty(0) && isatty(1)) {
100 iflag = 1;
101 if (Eflag == 2)
102 Eflag = 1;
103 }
104 if (mflag == 2)
105 mflag = iflag;
106 for (i = 0; i < NOPTS; i++)
107 if (optval[i] == 2)
108 optval[i] = 0;
109 arg0 = argv[0];
110 if (sflag == 0 && minusc == NULL) {
111 scriptname = *argptr++;
112 setinputfile(scriptname, 0);
113 commandname = arg0 = scriptname;
114 }
115 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
116 if (argptr && minusc && *argptr)
117 arg0 = *argptr++;
118
119 shellparam.p = argptr;
120 shellparam.reset = 1;
121 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
122 while (*argptr) {
123 shellparam.nparam++;
124 argptr++;
125 }
126 optschanged();
127 }
128
129
130 void
optschanged(void)131 optschanged(void)
132 {
133 setinteractive(iflag);
134 #ifndef NO_HISTORY
135 histedit();
136 #endif
137 setjobctl(mflag);
138 }
139
140 /*
141 * Process shell options. The global variable argptr contains a pointer
142 * to the argument list; we advance it past the options.
143 */
144
145 static void
options(int cmdline)146 options(int cmdline)
147 {
148 char *kp, *p;
149 int val;
150 int c;
151
152 if (cmdline)
153 minusc = NULL;
154 while ((p = *argptr) != NULL) {
155 argptr++;
156 if ((c = *p++) == '-') {
157 val = 1;
158 /* A "-" or "--" terminates options */
159 if (p[0] == '\0')
160 goto end_options1;
161 if (p[0] == '-' && p[1] == '\0')
162 goto end_options2;
163 /**
164 * For the benefit of `#!' lines in shell scripts,
165 * treat a string of '-- *#.*' the same as '--'.
166 * This is needed so that a script starting with:
167 * #!/bin/sh -- # -*- perl -*-
168 * will continue to work after a change is made to
169 * kern/imgact_shell.c to NOT token-ize the options
170 * specified on a '#!' line. A bit of a kludge,
171 * but that trick is recommended in documentation
172 * for some scripting languages, and we might as
173 * well continue to support it.
174 */
175 if (p[0] == '-') {
176 kp = p + 1;
177 while (*kp == ' ' || *kp == '\t')
178 kp++;
179 if (*kp == '#' || *kp == '\0')
180 goto end_options2;
181 }
182 } else if (c == '+') {
183 val = 0;
184 } else {
185 argptr--;
186 break;
187 }
188 while ((c = *p++) != '\0') {
189 if (c == 'c' && cmdline) {
190 char *q;
191 #ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */
192 if (*p == '\0')
193 #endif
194 q = *argptr++;
195 if (q == NULL || minusc != NULL)
196 error("Bad -c option");
197 minusc = q;
198 #ifdef NOHACK
199 break;
200 #endif
201 } else if (c == 'o') {
202 minus_o(*argptr, val);
203 if (*argptr)
204 argptr++;
205 } else
206 setoption(c, val);
207 }
208 }
209 return;
210
211 /* When processing `set', a single "-" means turn off -x and -v */
212 end_options1:
213 if (!cmdline) {
214 xflag = vflag = 0;
215 return;
216 }
217
218 /*
219 * When processing `set', a "--" means the remaining arguments
220 * replace the positional parameters in the active shell. If
221 * there are no remaining options, then all the positional
222 * parameters are cleared (equivalent to doing ``shift $#'').
223 */
224 end_options2:
225 if (!cmdline) {
226 if (*argptr == NULL)
227 setparam(argptr);
228 return;
229 }
230
231 /*
232 * At this point we are processing options given to 'sh' on a command
233 * line. If an end-of-options marker ("-" or "--") is followed by an
234 * arg of "#", then skip over all remaining arguments. Some scripting
235 * languages (e.g.: perl) document that /bin/sh will implement this
236 * behavior, and they recommend that users take advantage of it to
237 * solve certain issues that can come up when writing a perl script.
238 * Yes, this feature is in /bin/sh to help users write perl scripts.
239 */
240 p = *argptr;
241 if (p != NULL && p[0] == '#' && p[1] == '\0') {
242 while (*argptr != NULL)
243 argptr++;
244 /* We need to keep the final argument */
245 argptr--;
246 }
247 }
248
249 static void
minus_o(char * name,int val)250 minus_o(char *name, int val)
251 {
252 int i;
253 const unsigned char *on;
254 size_t len;
255
256 if (name == NULL) {
257 if (val) {
258 /* "Pretty" output. */
259 out1str("Current option settings\n");
260 for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1)
261 out1fmt("%-16.*s%s\n", *on, on + 1,
262 optval[i] ? "on" : "off");
263 } else {
264 /* Output suitable for re-input to shell. */
265 for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1)
266 out1fmt("%s %co %.*s%s",
267 i % 6 == 0 ? "set" : "",
268 optval[i] ? '-' : '+',
269 *on, on + 1,
270 i % 6 == 5 || i == NOPTS - 1 ? "\n" : "");
271 }
272 } else {
273 len = strlen(name);
274 for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1)
275 if (*on == len && memcmp(on + 1, name, len) == 0) {
276 setoptionbyindex(i, val);
277 return;
278 }
279 error("Illegal option -o %s", name);
280 }
281 }
282
283
284 static void
setoptionbyindex(int idx,int val)285 setoptionbyindex(int idx, int val)
286 {
287 if (optletter[idx] == 'p' && !val && privileged) {
288 if (setgid(getgid()) == -1)
289 error("setgid");
290 if (setuid(getuid()) == -1)
291 error("setuid");
292 }
293 optval[idx] = val;
294 if (val) {
295 /* #%$ hack for ksh semantics */
296 if (optletter[idx] == 'V')
297 Eflag = 0;
298 else if (optletter[idx] == 'E')
299 Vflag = 0;
300 }
301 }
302
303 static void
setoption(int flag,int val)304 setoption(int flag, int val)
305 {
306 int i;
307
308 for (i = 0; i < NSHORTOPTS; i++)
309 if (optletter[i] == flag) {
310 setoptionbyindex(i, val);
311 return;
312 }
313 error("Illegal option -%c", flag);
314 }
315
316
317 /*
318 * Set the shell parameters.
319 */
320
321 void
setparam(char ** argv)322 setparam(char **argv)
323 {
324 char **newparam;
325 char **ap;
326 int nparam;
327
328 for (nparam = 0 ; argv[nparam] ; nparam++);
329 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
330 while (*argv) {
331 *ap++ = savestr(*argv++);
332 }
333 *ap = NULL;
334 freeparam(&shellparam);
335 shellparam.malloc = 1;
336 shellparam.nparam = nparam;
337 shellparam.p = newparam;
338 shellparam.optp = NULL;
339 shellparam.reset = 1;
340 shellparam.optnext = NULL;
341 }
342
343
344 /*
345 * Free the list of positional parameters.
346 */
347
348 void
freeparam(struct shparam * param)349 freeparam(struct shparam *param)
350 {
351 char **ap;
352
353 if (param->malloc) {
354 for (ap = param->p ; *ap ; ap++)
355 ckfree(*ap);
356 ckfree(param->p);
357 }
358 if (param->optp) {
359 for (ap = param->optp ; *ap ; ap++)
360 ckfree(*ap);
361 ckfree(param->optp);
362 }
363 }
364
365
366
367 /*
368 * The shift builtin command.
369 */
370
371 int
shiftcmd(int argc,char ** argv)372 shiftcmd(int argc, char **argv)
373 {
374 int n;
375 char **ap1, **ap2;
376
377 n = 1;
378 if (argc > 1)
379 n = number(argv[1]);
380 if (n > shellparam.nparam)
381 return 1;
382 INTOFF;
383 shellparam.nparam -= n;
384 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
385 if (shellparam.malloc)
386 ckfree(*ap1);
387 }
388 ap2 = shellparam.p;
389 while ((*ap2++ = *ap1++) != NULL);
390 shellparam.reset = 1;
391 INTON;
392 return 0;
393 }
394
395
396
397 /*
398 * The set command builtin.
399 */
400
401 int
setcmd(int argc,char ** argv)402 setcmd(int argc, char **argv)
403 {
404 if (argc == 1)
405 return showvarscmd(argc, argv);
406 INTOFF;
407 options(0);
408 optschanged();
409 if (*argptr != NULL) {
410 setparam(argptr);
411 }
412 INTON;
413 return 0;
414 }
415
416
417 void
getoptsreset(const char * value)418 getoptsreset(const char *value)
419 {
420 while (*value == '0')
421 value++;
422 if (strcmp(value, "1") == 0)
423 shellparam.reset = 1;
424 }
425
426 /*
427 * The getopts builtin. Shellparam.optnext points to the next argument
428 * to be processed. Shellparam.optptr points to the next character to
429 * be processed in the current argument. If shellparam.optnext is NULL,
430 * then it's the first time getopts has been called.
431 */
432
433 int
getoptscmd(int argc,char ** argv)434 getoptscmd(int argc, char **argv)
435 {
436 char **optbase = NULL, **ap;
437 int i;
438
439 if (argc < 3)
440 error("usage: getopts optstring var [arg]");
441
442 if (shellparam.reset == 1) {
443 INTOFF;
444 if (shellparam.optp) {
445 for (ap = shellparam.optp ; *ap ; ap++)
446 ckfree(*ap);
447 ckfree(shellparam.optp);
448 shellparam.optp = NULL;
449 }
450 if (argc > 3) {
451 shellparam.optp = ckmalloc((argc - 2) * sizeof *ap);
452 memset(shellparam.optp, '\0', (argc - 2) * sizeof *ap);
453 for (i = 0; i < argc - 3; i++)
454 shellparam.optp[i] = savestr(argv[i + 3]);
455 }
456 INTON;
457 optbase = argc == 3 ? shellparam.p : shellparam.optp;
458 shellparam.optnext = optbase;
459 shellparam.optptr = NULL;
460 shellparam.reset = 0;
461 } else
462 optbase = shellparam.optp ? shellparam.optp : shellparam.p;
463
464 return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
465 &shellparam.optptr);
466 }
467
468 static int
getopts(char * optstr,char * optvar,char ** optfirst,char *** optnext,char ** optptr)469 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext,
470 char **optptr)
471 {
472 char *p, *q;
473 char c = '?';
474 int done = 0;
475 int ind = 0;
476 int err = 0;
477 char s[10];
478 const char *newoptarg = NULL;
479
480 if ((p = *optptr) == NULL || *p == '\0') {
481 /* Current word is done, advance */
482 if (*optnext == NULL)
483 return 1;
484 p = **optnext;
485 if (p == NULL || *p != '-' || *++p == '\0') {
486 atend:
487 ind = *optnext - optfirst + 1;
488 *optnext = NULL;
489 p = NULL;
490 done = 1;
491 goto out;
492 }
493 (*optnext)++;
494 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
495 goto atend;
496 }
497
498 c = *p++;
499 for (q = optstr; *q != c; ) {
500 if (*q == '\0') {
501 if (optstr[0] == ':') {
502 s[0] = c;
503 s[1] = '\0';
504 newoptarg = s;
505 }
506 else
507 out2fmt_flush("Illegal option -%c\n", c);
508 c = '?';
509 goto out;
510 }
511 if (*++q == ':')
512 q++;
513 }
514
515 if (*++q == ':') {
516 if (*p == '\0' && (p = **optnext) == NULL) {
517 if (optstr[0] == ':') {
518 s[0] = c;
519 s[1] = '\0';
520 newoptarg = s;
521 c = ':';
522 }
523 else {
524 out2fmt_flush("No arg for -%c option\n", c);
525 c = '?';
526 }
527 goto out;
528 }
529
530 if (p == **optnext)
531 (*optnext)++;
532 newoptarg = p;
533 p = NULL;
534 }
535
536 out:
537 if (*optnext != NULL)
538 ind = *optnext - optfirst + 1;
539 *optptr = p;
540 if (newoptarg != NULL)
541 err |= setvarsafe("OPTARG", newoptarg, 0);
542 else {
543 INTOFF;
544 err |= unsetvar("OPTARG");
545 INTON;
546 }
547 fmtstr(s, sizeof(s), "%d", ind);
548 err |= setvarsafe("OPTIND", s, VNOFUNC);
549 s[0] = c;
550 s[1] = '\0';
551 err |= setvarsafe(optvar, s, 0);
552 if (err) {
553 *optnext = NULL;
554 *optptr = NULL;
555 flushall();
556 exraise(EXERROR);
557 }
558 return done;
559 }
560
561 /*
562 * Standard option processing (a la getopt) for builtin routines. The
563 * only argument that is passed to nextopt is the option string; the
564 * other arguments are unnecessary. It return the character, or '\0' on
565 * end of input.
566 */
567
568 int
nextopt(const char * optstring)569 nextopt(const char *optstring)
570 {
571 char *p;
572 const char *q;
573 char c;
574
575 if ((p = nextopt_optptr) == NULL || *p == '\0') {
576 p = *argptr;
577 if (p == NULL || *p != '-' || *++p == '\0')
578 return '\0';
579 argptr++;
580 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
581 return '\0';
582 }
583 c = *p++;
584 for (q = optstring ; *q != c ; ) {
585 if (*q == '\0')
586 error("Illegal option -%c", c);
587 if (*++q == ':')
588 q++;
589 }
590 if (*++q == ':') {
591 if (*p == '\0' && (p = *argptr++) == NULL)
592 error("No arg for -%c option", c);
593 shoptarg = p;
594 p = NULL;
595 }
596 nextopt_optptr = p;
597 return c;
598 }
599